OpenWrt firmware is an open-source, Linux-based operating system designed to replace the stock firmware on commercial WiFi routers, enabling researchers to install custom tools and drivers that are not available on standard consumer devices. In the context of WiFi/CSI sensing research, it is critical because it allows commodity routers — such as the TP-LINK N750 — to be modified to run specialized software like the Atheros CSI Tool, which exposes fine-grained Channel State Information (CSI) data that is otherwise inaccessible. A key variant seen in the literature is the OpenWrt/Atheros-CSI firmware, which integrates Atheros chipset-specific CSI extraction capabilities directly into the OpenWrt environment, making it a foundational platform for device-free sensing applications such as occupancy detection and crowd counting.
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